KLF4 and breast cancer: The SNP rs10759243 in the KLF4 gene was associated with the PR- BC risk (OR = 1.315, 95% CI, 1.036–1.671, p = 0.024) and in the log-additive model (OR = 1.33, 95% CI, 1.04 – 1.68, p = 0.021).